<html xmlns="http://www.w3.org/1999/xhtml">
 <head>
  <title>valid embed contextmenu</title>
 </head>
 <body>
  <embed contextmenu='foo'/>
  <!-- Since contextmenu is no longer a global attribute,
       it is allowed on embed like any other unknown attribute,
       and shouldn't give a warning or error about not matching
       the ID of a <menu type='context'> etc. -->
 </body>
</html>
